#define _CRT_SECURE_NO_WARNINGS 1

#include"Date.h"

int Date::GetMonthDay(int year, int month)
{
	static int day[13] = { -1,31,28,31,30,31,30,31,31,30,31,30,31 };
	if (month == 2 && ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0))
	{
		return 29;
	}
	return day[month];
}

Date::Date(int year, int month, int day)
{
	_year = year;
	_month = month;
	_day = day;
}

Date::Date(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
}

//d1 = d2
Date& Date::operator=(const Date& d)
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
	return *this;
}

Date::~Date()
{
	_year = 0;
	_month = 0;
	_day = 0;
}

void Date::Print()
{
	cout << _year << "/" << _month << "/" << _day << endl;
}

Date& Date::operator+=(int day)
{
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		_month++;
		if (_month == 13)
		{
			_year++;
			_month = 1;
		}
	}
	return *this;
}

Date Date::operator+(int day)
{
	Date tmp(*this);
	tmp += day;
	return tmp;
}

Date Date::operator-(int day)
{
	Date tmp(*this);
	tmp._day -= day;
	while (tmp._day <= 0)
	{
		tmp._month--;
		if (tmp._month == 0)
		{
			tmp._year--;
			tmp._month = 12;
		}
		tmp._day += GetMonthDay(tmp._year, tmp._month);
	}
	return tmp;
}

Date& Date::operator-=(int day)
{
	*this = *this - day;
	return *this;
}

Date& Date::operator++()
{
	*this += 1;
	return *this;
}

Date Date::operator++(int)
{
	Date tmp(*this);
	*this += 1;
	return tmp;
}

Date& Date::operator--()
{
	*this -= 1;
	return *this;
}

Date Date::operator--(int)
{
	Date tmp(*this);
	*this -= 1;
	return tmp;
}

bool Date::operator>(const Date& d)
{
	if (_year > d._year)
	{
		return true;
	}
	else if(_year == d._year)
	{
		if (_month > d._month)
		{
			return true;
		}
		else if (_month == d._month)
		{
			return _day - d._day;
		}
	}
	return false;
}

bool Date::operator>=(const Date& d)
{
	return (*this > d) || (*this == d);
}

bool Date::operator<(const Date& d)
{
	return !(*this >= d);
}

bool Date::operator<=(const Date& d)
{
	return !(*this > d);
}

bool Date::operator==(const Date& d)
{
	return _year == d._year && _month == d._month && _day == d._day;
}

bool Date::operator!=(const Date& d)
{
	return !(*this == d);
}

int Date::operator-(const Date& d)
{
	int flag = 1;
	Date max = *this;
	Date min = d;

	if (*this < d)
	{
		max = d;
		min = *this;
		flag = -1;
	}

	int n = 0;
	while (min != max)
	{
		--min;
		++n;
	}
	return n * flag;
}